From the help index for INDEX. Here is where you use the match formula for
the ROW part of the index formula.
INDEX
See Also
Returns the reference of the cell at the intersection of a particular row
and column. If the reference is made up of nonadjacent selections, you can
pick the selection to look in.
The INDEX function has two syntax forms: array and reference. The array form
always returns a value or an array of values; the reference form always
returns a reference.
Syntax 2
Reference form
INDEX(reference,row_num,column_num,area_num)
Reference is a reference to one or more cell ranges.
a.. If you are entering a nonadjacent range for the reference, enclose
reference in parentheses.
b.. If each area in reference contains only one row or column, the row_num
or column_num argument, respectively, is optional. For example, for a single
row reference, use INDEX(reference,,column_num).
Row_num is the number of the row in reference from which to return a
reference.
Column_num is the number of the column in reference from which to return a
reference.
Area_num selects a range in reference from which to return the
intersection of row_num and column_num. The first area selected or entered
is numbered 1, the second is 2, and so on. If area_num is omitted, INDEX
uses area 1.
a.. For example, if reference describes the cells (A1:B4,D1:E4,G1:H4),
then area_num 1 is the range A1:B4, area_num 2 is the range D1:E4, and
area_num 3 is the range G1:H4.
Remarks
a.. After reference and area_num have selected a particular range, row_num
and column_num select a particular cell: row_num 1 is the first row in the
range, column_num 1 is the first column, and so on. The reference returned
by INDEX is the intersection of row_num and column_num.
b.. If you set row_num or column_num to 0 (zero), INDEX returns the
reference for the entire column or row, respectively.
c.. Row_num, column_num, and area_num must point to a cell within
reference; otherwise, INDEX returns the #REF! error value. If row_num and
column_num are omitted, INDEX returns the area in reference specified by
area_num.
d.. The result of the INDEX function is a reference and is interpreted as
such by other formulas. Depending on the formula, the return value of INDEX
may be used as a reference or as a value. For example, the formula
CELL("width",INDEX(A1:B2,1,2)) is equivalent to CELL("width",B1). The CELL
function uses the return value of INDEX as a cell reference. On the other
hand, a formula such as 2*INDEX(A1:B2,1,2) translates the return value of
INDEX into the number in cell B1.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How?
1.. Create a blank workbook or worksheet.
2.. Select the example in the Help topic. Do not select the row or column
headers.
Selecting an example from Help
3.. Press CTRL+C.
4.. In the worksheet, select cell A1, and press CTRL+V.
5.. To switch between viewing the results and viewing the formulas that
return the results, press CTRL+` (grave accent), or on the Tools menu, point
to Formula Auditing, and then click Formula Auditing Mode.
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A B C
Fruit Price Count
Apples 0.69 40
Bananas 0.34 38
Lemons 0.55 15
Oranges 0.25 25
Pears 0.59 40
Almonds 2.80 10
Cashews 3.55 16
Peanuts 1.25 20
Walnuts 1.75 12
Formula Description (Result)
=INDEX(A2:C6,2,3) The intersection of the second row and third
column in the range A2:C6, which is the content of cell C3. (38)
=INDEX((A1:C6,A8:C11),2,2,2) The intersection of the second row
and second column in the second area of A8:C11, which is the content of cell
B9. (3.55)
=SUM(INDEX(A1:C11,0,3,1)) The sum of the third column in the
first area of the range A1:C11, which is the sum of C1:C6. (216)
=SUM(B2:INDEX(A2:C6,5,2)) The sum of the range starting at B2,
and ending at the intersection of the fifth row and the second column of the
range A2:A6, which is the sum of B2:B6. (2.42)